11554516131621 has 4 divisors (see below), whose sum is σ = 15406021508832. Its totient is φ = 7703010754412.

The previous prime is 11554516131569. The next prime is 11554516131647. The reversal of 11554516131621 is 12613161545511.

11554516131621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11554516131621 - 2²⁹ = 11553979260709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11554516131661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1925752688601 + ... + 1925752688606.

It is an arithmetic number, because the mean of its divisors is an integer number (3851505377208).

Almost surely, 2^{11554516131621} is an apocalyptic number.

It is an amenable number.

11554516131621 is a deficient number, since it is larger than the sum of its proper divisors (3851505377211).

11554516131621 is an equidigital number, since it uses as much as digits as its factorization.

11554516131621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3851505377210.

The product of its digits is 108000, while the sum is 42.

The spelling of 11554516131621 in words is "eleven trillion, five hundred fifty-four billion, five hundred sixteen million, one hundred thirty-one thousand, six hundred twenty-one".